Positive Phase III Rusfertide Results

The study met its primary endpoint and all four key secondary endpoints. Rusfertide is a first-in-class investigational hepcidin mimetic peptide therapeutic, which has received Orphan Drug designation and Fast Track designation from the FDA. 

Key findings from the study include:

• i.The primary endpoint of the study was met, with a significantly higher proportion of clinical responders among rusfertide-treated patients with PV (77%) compared to those who received placebo (33%) during weeks 20-32; p<0.0001. The primary endpoint of the study was the proportion of patients achieving a response, which was defined as the absence of phlebotomy eligibility.
• ii. The first key secondary endpoint, which is the pre-specified primary endpoint for European Union (EU) regulators, was also met, with a mean of 0.5 phlebotomies per patient in the rusfertide arm compared to 1.8 phlebotomies per patient in the placebo arm during weeks 0-32; p<0.0001.
• iii. The other three pre-specified key secondary endpoints, namely hematocrit control and patient-reported outcomes using PROMIS Fatigue SF-8a  and MFSAF TSS-7, were also achieved with statistical significance.
• Rusfertide was generally well tolerated in the Phase III VERIFY trial, and safety was in line with previous rusfertide clinical studies. No new safety findings were observed in the study. The majority of adverse events were grade 1-2 injection site reactions and all serious adverse events reported were deemed to be not drug related. There was no evidence of an increased risk of cancer in rusfertide-treated patients compared to those on placebo.
• The Phase III VERIFY trial (NCT05210790) is an ongoing, three-part, global, randomized, placebo-controlled trial evaluating rusfertide in 293 patients with polycythemia vera over a 156-week period. The trial is evaluating the efficacy and safety of once-weekly, subcutaneously self-administered rusfertide in patients with uncontrolled hematocrit who are phlebotomy dependent despite standard of care treatment, which could include hydroxyurea, interferon and/or ruxolitinib. The primary endpoint of the study was the proportion of patients achieving a response during weeks 20-32, which was defined as the absence of “phlebotomy eligibility.” To meet phlebotomy eligibility, patients in the study were required to have: confirmed hematocrit ≥45% that was ≥3% higher than their baseline hematocrit value, or hematocrit ≥48%.
• All patients have completed their participation in the randomized, placebo-controlled portion of the trial evaluating the efficacy and safety of rusfertide plus current treatment versus placebo plus current treatment and are now in the open-label portions of the trial.